hwmon: (w83627hf) Add individual alarm and beep files

The new libsensors needs these individual alarm and beep files. The
code was copied from the w83781d driver. I've tested the alarm files
on a W83627THF. I couldn't test the beep files as the system in
question doesn't have a speaker.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>